Athletics at the 1920 Summer Olympics – Men's 100 metres

This was the sixth time the event was held, having appeared at every Olympics since the first in 1896. None of the 1912 medalists returned in 1920. Notable entrants included Charley Paddock of the United States, the 1919 Inter-Allied Championship winner and Olympic favorite; fellow American Loren Murchison, who had defeated Paddock in the U.S. Olympic trials; and Harry Edward of Great Britain, the 1920 AAA Championships winner.[2]

Egypt, Luxembourg, Monaco, New Zealand, Spain, and Switzerland were represented in the event for the first time. The new nation of Czechoslovakia also appeared for the first time, though Bohemia had previously competed separately. For the first time, Hungary did not compete (a result of not being invited after World War I)—making the United States the only nation to have appeared at each of the first six Olympic men's 100 metres events.

The event expanded from three rounds (in 1908 and 1912) to four rounds: heats, quarterfinals, semifinals, and a final. There were 12 heats, of 4–6 athletes each, with the top 2 in each heat advancing to the quarterfinals. The 24 quarterfinalists were placed into 5 heats of 4 or 5 athletes. Again, the top 2 advanced. There were 2 heats of 5 semifinalists, this time with the top 3 advancing to the 6-man final.[2]

These were the standing world and Olympic records (in seconds) prior to the 1920 Summer Olympics.

World Record	10.6(*)	Donald Lippincott	Stockholm (SWE)	July 6, 1912
Olympic Record	10.6	Donald Lippincott	Stockholm (SWE)	July 6, 1912

(*) This was the only officially ratified world record in 1920, but there have been at least four runs in 10.5 seconds at that time. (see the records prior the 1912 Summer Olympics.)

• Belgium Olympic Committee (1957). Olympic Games Antwerp 1920: Official Report (in French).
• Wudarski, Pawel (1999). "Wyniki Igrzysk Olimpijskich" (in Polish). Retrieved 11 August 2007.